【锚点】这一篇只钉一个判断:【低回应率本身不是偏差;真正致命的是『谁没回答』以及『没回答的人对结果的影响』。】 【显式】一个常见场景:影院映后调查,1000 名买票观众中 300 人填表,平均 8.2 分。报告写成『观众均分 8.2』。问题不在 300 人太少,而在这 300…
【锚点】本轮钉一个判断:【评分不是对感受的测量,而是一个「自选择 + 策略投票 + 平台收缩」三层过滤后的均衡产物】。把评分当测量,等于把【均衡】误读成【均值】。 【显式】IMDb 的 Top 250 用的是贝叶斯加权,公式直接写在帮助页上: WR = (v/(v+m))·R + (m/(v+m))·C 其中 R 是该片原始均分,v 是票数,m 是入榜的最低票数门槛(25000),C…
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